Knife-moistening means for cutting machines



c. P. STEVENSON ETAL 2,526,779 KNIFE-MOISTENING MEANS FOR CUTTINGMACHINES Oct. 24, 1950 4 Sheets-Sheet 1 Filed Aug. 2, 1946 mmm w? W mkfe 0 ,W M41 m 0 a ,L Q a W ,0 a% 6 a H11 4 m n 7///\ M w 0 6 .0 we a H 9A 7 3 V 3 w Oct. 24, 1950 c.- P. STEVENSON ETAL 2,526,779

KNIFE-MQISTENING MEANS FOR CUTTING lviACI-{IIIES Filed Aug. 2, 1946 4Sheets-Sheet 2 INVENTORJf ffiiiarfmn 1071/ z t orveys.

Oct. 24, 1950 -C- P. STEVENSON KNIFE-MOISTENING MEANS FOR CUTTINGMACHINES Sheets-Sh; j 3

Fired Aug. 2; 1946 IN VEN TORS,

By I 6hr Oct. 24, 1950 c. P. STEVENSON EI'AL 2,526,779

xmFs-morsmmue MEANS-FOR CUTTING mgcmmas Filed Aug. 2, 1946 4Siiegts-She'f i dfi orweys.

Patented Oct. 24, 1950 KNIFE-MOISTENING MEANS FORCUTTING MACHINESCharles P. Stevenson and Lester J. Ulrich, Buffalo, N. Y., assignors toEastman Machine Company,

Buffalo, N. Y.

Application August 2, 1946, Serial No. 688,054

13' Claims.

This. invention relates to a meansfor moisten- "ing the knives. ofcutting machines, more particularly of that type, commonly used forcutting 'clothand other sheet materials, which have an uprightreciprocating knife with a substantially vertical front cutting edgethat can be caused to follow adesired pattern or line of cut in a pileor lay of sheets by appropriately guiding the machine about upon thesupporting table or surface for the material. Such machines are commonlyequipped with knife-sharpening mechanisms, of which a well known typecomprises flexible grinding belts that are arranged at opposite sides ofthe knife and'driven so as to travel hori- Zontally. or transverselywith respect to the length of the knife edge for sharpening the knife.These belts are relatively narrow, and when the sharpening mechanism isnot being used. to sharpen the knife, it occupies a position at theupper portion of the upright knife-guiding standard of the machine, wellabove the material being out, where it is out of the way and does notinterfere with the cutting operation of the machine. When the kniferequires sharpening, the sharpening belts aredriven and are shifted ormoved downwardly and upwardly along the knife for sharpening its edgethroughout its length.

In the, use of machinesof this type for cutting certainkinds ofmaterials, suchfor instance as some synthetic plastic and othersheet-materials, the cut edges of the sheets tend to stick or adhere tothe knife, and to each other due, it is believed, to, the fact that theheat resulting from the friction produced by the rapidly reciprocatingknife, acts to soften or fuse the material and cause it to becomeadherent. This tendency of the sheets to adhere to each otherand to thesurfaces of the knife greatly increasesthe load on the knife-drivingmotor, reduces the efficiency of operation of the-machine andseriouslyinterferes with the ease and facility of manipulation of themachine in use. Furthermore, the adhesion of the cut edges of thesheetsto each other makes necessary thetime-consuming and tediousoperation of pulling apart the adhering edges of the sheets one afteranother before the cut sheets can be used for most intended purposes.The efficiency and ease of operation of the machine in cutting suchmaterials can be greatly increased and improved and ultimately muchlabor and time saved if during the cutting operation the faces of'theknife that contact with the material are kept wet or moistened with asuitable fluid or moistening medium which will prevent the heating andconsequent softening or stickiness of the materials being cut.

An object of this invention is to accomplish these results by providingefiicient and. desirable means for wetting or moistening the knifeduring its cutting operation with a suitable fiuidor solution.

It is important to the convenient and effective use of the machine thatthe means for moistening the knife shall not interfere with theoperation or use of the sharpening mechanism for sharpening theknife,and, furthermore shall not obstruct 0r interferewith the operators viewin watching the cutting operation of the knife so as to prevent him fromproperly guiding the machine,,as required, to cause the knife to followthe required line of cut. Another object of the invention, therefore, istoprovide a knife-moistening means of an arrangement or constructionwhich will not interfere with the operation of the knife-sharpeningmeans or obstruct or interfere with the operators view of the machinenecessary to its proper operation in cutting.

Other. objects of the invention are to equip a cutting machine with aknife-moistening means which, in its operative position, i disposedadjacent to and operable to apply moisture to the surfaces of' theknife, but which in such posi tion, does not prevent the operator fromreadily seeing those portions of the knife which are cutting thematerial, and which moisture-applying means is readily shiftable awayfrom its operative position adjacent the knife to a position in whichit" will not interfere with the movement of the knife-sharpeningmechanism along the edgeof the knife; also to provide knife-moisteningmeans of a character such that when the sharpening mechanism is operatedto sharpen a knife, it acts automatically to shift the moisteni ng meansaway from its operative position to a position where it is out of thepath of movement of the sharpening mechanism.

Further objects and advantages of the invention will appear from thefollowing specification of the different embodiments of the inventionshown in the accompanying drawings, and the novel features of theinvention are set forth in the appended claims.

In said drawings:

Fig. 1 is a fragmentary side elevation of a cutting machine of thetypementioned, equipped with knife-moistening means of one formembodying the invention.

Fig. 2 is'a sectional plan view on line 2--2, Fig. 1, showing themoistening means in operative position relative to the knife.

Fig. 31s a similar view showing the moistening means shifted to aposition where it will not interfere with the operation of thesharpening mechanism.

Fig. 4 is a front elevation of the moistening means in its operativeposition.

Fig. 5 is a section through one of the moistening elements on line 55,Fig. 3.

Fig. 6 is a fragmentary side elevation illustrating knife-moisteningmeans of a different form embodying the invention.

Fig. 7 is a sectional plan view thereof on line l-l, Fig. 6, showing bysolid and broken lines respectively the operative and inoperativepositions of the moistening means.

Fig. 8 is a sectional elevation thereof on line 8-8, Fig. '7.

Fig. 9 is a sectional detail thereof on line 99, Fig. 6.

Fig. 10 is a fragmentary rear elevation illustrating anothermodification of the invention, and showing the operative and inoperativepositions of the moistening elements respectively by solid and brokenlines.

Fig. 11 is a side elevation of the device shown in Fig. 10.

The drawings illustrate knife-moistening means of different formsembodying the invention, applied to a cutting machine of knownconstruction which, insofar as necessary to an understanding of theinvention, may be briefly described as follows: The machine, see Fig. 1,comprises the usual base l5 adapted to rest on the cutting table orsupport for the material, a standard l6 rising from said base andforming the support for the knife-operating motor, indicated at H, andalso forming a guide for the vertical knife l8, which is operativelyconnected with the motor for reciprocating the knife vertically. Theknife-sharpening mechanism shown comprises two endless flexible belts l9and which have suitable abrasive or grinding surfaces and are disposedso as to travel horizontally or transversely relatively to the length ofthe knife at opposite sides thereof. The grinding belts pass aroundsuitable front and rear supporting pulleys 2| and 22, of which the frontpulleys are operatively connected to a vertical drive shaft 23 which maybe driven by suitable mechanism (not shown) from the knifeoperatingmotor for driving the belts. The sharpening belts are operativelyassociated with a suitable carriage 24 (indicated by broken lines inFig. 3) which is slidably mounted in the machine to be shifted or moveddown and up along the knife for presenting the travelling sharpeningbelts to different portions of the knife edge lengthwise thereof. Beltsharpening mechanisms of this sort are in use and well known, and alsodisclosed in various patents, and further description of theconstruction and operation thereof is considered unnecessary.

25 represents the usual presser foot for engaging and holding down thematerial being cut in front of the knife, and 26 the usual presser footrod, which extends vertically in front of the knife and is adjustablysupported by usual or suitable means on the machine to enable theadjustment of the presser foot vertically, as may be required, for pilesor lays of different thickness of the material being out.

As illustrated in Figs. 1-5 of the drawings, the moistening device ismounted on and adjustable vertically with the presser foot rod 26 toplace it at the most suitable elevation relatively to the knife,depending upon the thickness of the particular lay of material beingcut. The device comprises an arm or member 3|] which is shown assuitably pivoted at its front end to a bracket or part 3| formed on orfixed to the presser foot or presser foot rod 26, and extends rearwardlytherefrom, at one side of the knife standard IE to a point in rearthereof, and a second arm 32, which is suitably pivoted at 33 to therear end of the arm 30 and extends forwardly therefrom at the oppositeside of the knife standard. These arms or members 30 and 32 support orcarry moistening elements 34 and 35 which may be of any suitable typeadapted to apply a moistening fluid or solution to the surfaces of theknife, but as shown, consist of bodies or pads 36 of sponge or othersuitable liquid permeable material retained in the inner ends of hollowholders or containers 31 and 38 formed or secured on the supporting arms30 and 32 in position for the sponges or pads 36, in the operativepositions of the moistening elements, to contact or wipe against theopposite faces of the knife and apply thereto moisture or fluid from thepads. A suitable spring 39, connected at its opposite ends to the arm 30and to the pivot support for the same, acts normally to hold the arm 30in its operative position with its moistening element against one sideof the knife, as shown in Fig. 2, and a spring 40 connected at itsopposite ends to the rear portions of the two arms 30 and 32 adjacenttheir connecting pivot acts to normally hold the arm 32 with the pad ofits moistening element against the opposite face of the knife, as alsoshown in Fig. 2. The spring 39 is preferably disposed relatively to thesupporting pivot of the arm 30 so that normally it acts as stated, tohold the arm 30 in its rearwardly exte'nding operative position in whichthe pad of its moistening element 34 is pressed against the adjacentface of the knife, and when the arm is moved outwardly away from theknife, -the spring is shifted across the pivotal axis and acts toreleasably hold the arm in an inoperative position, indicated in Fig. 3,distant from the knife. Similarly, the spring 40 acts normally to pressthe pad of the other moistening element 35 against the opposite face ofthe knife, and when this arm 32 is swung outwardly away from the knifethis spring is shifted across the pivotal axis of the arm 32 andreleasably holds the latter in the inoperative position shown in Fig. 3.A stop shoulder or part 4| on the main arm 30 is adapted to engage thepivot bracket for the arm and limit the outward movement of the arm, anda stop or part 42 on the arm 32 is adapted to engage the rear portion ofthe arm 30 to limit the outward movement of the arm 32. Thus, thesesprings normally hold the moistening elements in their operativepositions, shown in Fig. 2, with their pads pressed against the oppositefaces of the knife, and in order to move the moistening device from itsoperative to its inoperative position, it is only necessary to swing thearm 32 outwardly and rearwardly around the knife standard, therebyswinging the main supporting arm 30 also outwardly to its inoperativeposition with the moistening elements spread apart, as shown in Fig. 3,in which positions the elements will be releasably retained bysaidsprings. When the moistening elements are thus moved to theirinoperative positions, they are out of the way, clear of the path ofmovement of the knife-sharpening mechanism, so as not to interfere withthe sharpening movement of the latter downwardly and upwardly along theknife edge.

It will be noted that in the operative position of the moisteningelements 34 and 35, the element 35 does not project forwardly beyondapproximatelythe front cutting..edge:;of.:the knife and, as shown,inclines or recedes rearwardly. from its front end positioned .as.stated, or so that it does not project forwardlyof a transverse verticalplane approximately coincident with the front edge of the knife.Therefore, this moistening element, which-is located at that side of theknife from which the operator looks .at the ma.-

chine in guiding it to cause the knife to follow the line of cut, doesnot obstruct the operators view of that portion of the knife close to.where it enters the material in cutting it. The moistening element 34 atthe opposite side of the knife likewise can be formed and .arrangedto...similarly incline or recede rearwardly from a point. adjacent thecutting edge of the knife, and is so shown, but this is not so necessaryin the case of this element, since it is at the opposite side .of

the knife from which the same is ordinarily viewed by the operator andso would not beapt to obstruct his view.

The fluid or solution for moistening the knife may be supplied to themoistening elements in any suitable manner, as for instance, from one ormore reservoirs or containers 43 suitably supported on the machine, andconnected by flexible delivery tubes i l to thepad containers of themoistening elements.

In the different embodiment of the invention, shown in Figs. 6-9, themoistening elements 34a and 35a are mounted at opposite sides of theknife on carrying arms 59 and 5!, which in the operative position of thedevice, extend rearwardly from the moistening elements at opposite sidesof the knife-standard to a support suitably :5'

mounted on the machine at the rear of the knife standard. This supportmay consist of a vertical rod or bar 52 which, like the presser foot rod26, is adjustable vertically in a suitable clamp or mounting device 53on the motor housing or other appropriate part of the machine, so as topermit the bar to be adjusted vertically to locate the moistening deviceat the required height or elevation relatively to the knife. As shown,the carrying arms 56 and 5! for the moistening elements are pivoted attheir rear ends, as by pivot studs 54 to a bracket or part 55 secured onthe supporting rod 52, to permit the arms 50, 5! to be swung outwardlyand rearwardly away from their operative positions adjacent oppositesidesof the knife to inoperative positions distantfrom the knife and outof the up and down path oftravel of the knife-sharpening mechanism whensharpening the knife. Preferably, as shown, the supporting arms 5!], 5!for the moistening elements are geared together, as by intermeshing gearpinions 56 on their pivot studs, so that when one arm is swungoutwardly, the other arm will be simultaneously and correspondinglyswung in the opposite direction outwardly away from the. knife standard.Also, preferably the arms 50,15!- are connected by a spring 5! whichnormally acts to pull the arms toward each other and press the pads ofthe moistening elements against opposite faces of the knife, and whichspring, when the arms are swung out to their inoperative positions,shifts past the pivotal pointsfor the arms and acts to releasablyholdthe arms in such inoperative positions Except as above described, thisembodiment of the moistening device may. be similar to the constructionfirst described, in which the moistening elements consist of sponges orpermeable pads arranged to contact with opposite faces of the knife andare retained in hold ers to which the moistening, fluid or solution. is

delivered from a suitable source of supply through.

flexible tubes connected with the sponge or pad containers, and themoistening elements are preferably formed and disposed in such'manner,as explained in connection with the first construction, as not toobstruct the view of theoperator to the cutting portion of the knife inthe use of moved manually from, their. operative; positions. adjacentopposite sides of the knife topositions; in which they. are out'of thepath'of travelof the sharpening. mechanism when the latter is operatedto sharpen the knife. However, the

moistening device may, if desired, be constructed;

and arranged so as to be operated automatically,

by operation of the sharpening mechanism,...t01 move the moisteningdevice out of the way-gof;

the sharpening mechanism when the latter isoperated to sharpen theknife,

sides of the knife by means of supporting arms 60 and 6 I. supports53secured to the-lowerendsof vertical rods 64 which are disposed atopposite sidesv of}: the knife standard l6 and are adjustable verti-'callyin suitable brackets 65, which may project laterally from oppositesides of the upper portion of the'machine, and permit theadjustment ofthe moistening elements to different required;

Mounting elevations relatively to. the knife. brackets 65 for thesupporting. rodsfi i may be provided with screw operated clamping guides66. or means of other appropriate construction adapted to securethesupporting rods. 84 for the moistening elements in different verticaladjustments. The supporting arms .60 and 6! for the moistening elements,as shown, are normally held in operative position with their padspressed against opposite faces of the knife, as by suitable springs '6"!connected at opposite ends to the arms 6Q, GI and to the supporting rods54 for the. arms. Mounted on or connected with the vertically movablecarriage 2 ib.of the sharpening mechanism,

at opposite sides of the knife standard so as to.

travel up and down therewith, are operating elements 59, each arrangedto engage a curved or cam-shaped edge or face [9 of one of thesupporting arms for the moistening elements and adapted, when theknife-sharpening mechanism is moved downwardly along the knife insharpening the same, to ride along-said cam edges of the arms andthereby swing the arms outwardly versely along said cam edges of themoistening element arms and permit the elements to be returned by theirsprings 6': to their operative positions in which they contact with. orapply moisture-to the opposite faces of the knife.

' It should be manifest from the foregoing specification of differentembodiments of the invention, that knife-moistening elements or meanssuch as disclosed, or of other suitable character, can be arranged invarious other ways to accomplish the described functions of theinvention,

andavhereby the moistening means, when in the.

Such a construe? tion is shown in Figs. Y10 and 11, in which twomoistening elements 3% and 35b, which may be. similar to the moisteningelements previously described, and similarly supplied with a moisten-.1ing fluid or solution, are mounted at opposite.

Thesearmsare suitably pivoted at 62 on I operative position, will notobstruct or obscure the necessary view of the cutting action of themachine by th operator, and the moistening means can be shifted manuallyOr automatically so as not to interfere with the operation of theknife-sharpening mechanism. Therefore, in its broader aspects, theinvention is not restricted to the particular constructions hereindisclosed.

We claim:

1. In a cutting machine comprising a knife having a substantiallyupright cutting edge and driven in a direction lengthwise of said edgein performing its cutting operation, and knifesharpening means shiftablelengthwise along said edge when sharpening the knife, a knife moisteningdevice supported on said machine and comprising a pair of moisteningelements arranged to contact with opposite sides of the knife, meansmovably mounting said elements for movement from operative positions inwhich they are located adjacent to and apply moisture to opposite sidefaces of the knife, to inoperative positions distant from the knife andout of the path of movement of said sharpening means lengthwise of theedge of th knife, and connections between said mounting means operableby movement of one element to its inoperative position to move the otherelement to its inoperative position.

2. In a cutting machine comprising a knife having a substantiallyupright cutting edge and driven in a direction lengthwise of said edgein performing its cutting operation, and knifesharpening means shiftablelengthwise along said edge when sharpening the knife, a knife moisteningdevice supported on said machine and comprising a moistening elementmovably mounted for movement from an operative position adjacent theplane of the knife in which it applies a moistening medium to the knife,to an inoperative position distant from the knife and out of the path ofmovement of said sharpening means lengthwise of the edge of the knife,and means operable by movement of said sharpening means lengthwise ofthe knife edge to move said moistening element to its inoperativeposition out of the path of movement of said sharpening means.

3. In a cutting machine comprising a knife having a substantiallyupright cutting edge and driven in a direction lengthwise of said edgein performing its cutting operation, and knifesharpening means shiftablelengthwise along said edge when sharpening the knife, a knife moisteningdevice supported on said machine and comprising a moistening elementmovably mounted for movement from an operative position adjacent theplane of the knife in which it applies a moistening medium to the knife,to an inoperative position distant from the knife and out of the path ofmovement of said sharpening means lengthwise of the edge of the knife, amember movable with said sharpening means, and a member which isconnected to said moistening element and is engaged by said firstmentioned member to move said moistening element out of the path ofmovement of said sharpening means when the latter is shifted lengthwiseof said knife edge.

4. In a cutting machine comprising a knife having a substantiallyupright cutting edge and driven in a direction lengthwise of said edgein performing its cutting operation, and knifesharpening means shiftablelengthwise along said edg when sharpening a knife, a knife moisteningdevice supported on said machine and comprising a moistening elementmovably mounted for movement from an operative position adjacent theplane of the knife in which it applies a moistening medium to the knife,to an inoperative position distant from the knife and out of the path ofmovement of said sharpening means lengthwise of the edge of the knife,and means operable by movement of said sharpening means in one directionalong the knife to move said moistening element from its operativeposition to its inoperative position, and operating upon the returnmovement of said sharpening means to return said moistening element toits operative position.

5. In a cutting machine comprising an upright reciprocating knife with asubstantially upright cutting edge, moistening means for said knifecomprising a support, moistening elements mounted on said support andmovable thereon from operative positions adjacent opposite faces of theknife in which said elements apply moisture to said faces of the knife,to inoperative positions distant from the knife, and spring meansoperable to releasably retain said moistening elements in their saidoperative positions and also in their said inoperative positions.

6. In a cutting machine comprising an upright reciprocating knife with asubstantially upright cutting edge, a pair of moistening means for saidknife comprising a support, moistening elements mounted on said supportand movable thereon in different directions from operative positionsadjacent opposite faces of the knife in which said elements applymoisture to said faces of the knife, to inoperative positions distantfrom the knife, arms on which said elements are supported andconnections between said arms operable upon movement of one of saidelements to or from its operative position to simultaneously move theother element to or from its operative position.

'7. In a cutting machine comprising an upright reciprocating knife witha substantially upright cutting edge, a pair of moistening means forsaid knife comprising a support, moistening elements mounted on saidsupport and movable thereon in different directions from operativepositions adjacent opposite faces of the knife in which said elementsapply moisture to said faces of the knife, to inoperative positionsdistant from the knife, arms on which said elements are supported connections between said arms operable upon movement of one of saidelements to or from its operative position to simultaneously move theother element to or from its operative position, and spring means actingon said arms and operable to releasably retain said moistening elementsin both their operative and inoperative positions.

8. In a cutting machine comprising an upright reciprocating knife with asubstantially upright cutting edge, moistening means for said knifecomprising a supporting rod arranged in front of said knife andadjustable vertically on the machine, an arm pivoted on said rod andextending to the rear of the knife at one side thereof, a second armpivoted to the rear portion of said first arm and extending forwardly atthe opposite side of said knife, moistennig elements carried by saidarms and movable therewith from operative positions adjacent oppositefaces of the knife in which said elements apply moisture to said facesof the knife, to inoperative positions distant from the knife, a springwhich normally holds said first arm with the moistening element carriedthereby in its said operative position, and a spring which connects saidarms and normally holds said second arm with the moistening elementcarried thereby in its said operative position.

9. In a cutting machine] comprising a knife having a substantiallyupright cutting edge,

mechanism for drivin the knife in a direction lengthwise of said edgefor performing its cutting operation, and knife-sharpening means mountedand shiftable on the machine lengthwise along said edge when sharpeningthe knife, the improved knife-moistening device mounted on said machineand comprising a pair of moisture-holding elements, supporting arms forsaid elements mounted on said machine and movable to shift said elementsinto operative positions in wiping contact with opposite sides of theknife, in which said elements appl moistening media to the knife, andinto inoperative position distant from the knife and out of the path ofmovement of said sharpening means lengthwise of the edge of the knife.

10. In a cutting machine comprising a knife having a substantiallyupright cutting edge, mechanism for driving the knife in a directionlengthwise of said edge for performing its cutting operation, andknife-sharpening means mounted and shiftable on the machine lengthwisealong said edge when sharpening the knife, the improved knife moisteningdevice mounted on said machine and comprising a pair of moisturepermeable elements, supporting arms on which said elements are mountedand which are pivotally mounted on said machine and which may swingabout their pivotal mounting to place said elements into engagement withopposite sides of said knife in wiping contact with opposite faces ofthe knife in which said elements apply moisture said supporting armsbeig swingable to move said elements into said faces of the knife, toinoperative positions distant from the knife and out of the path ofmovement of said knife-sharpening means lengthwise of said knife edge.

11. In a cutting machine comprising a knife having an upright frontcutting edge, mechanism for driving the knife in a direction lengthwiseof said edge in performing its cutting operation, and knife-sharpeningmeans mounted and shiftable on the machine lengthwise along said edgewhen sharpening the knife, the improved knife-moistening devicecomprising moistureholding elements arranged at opposite sides of theknife, means movably mounting said elements on the machine for movementfrom operative positions in wiping contact with opposite sides of theknife for applying the moisture on the opposite side faces of the knife,to inoperative positions distant from the knife and out of the path ofmovement of said sharpening means length- Wise of the edge of the knife,at least one of said 'said edge when sharpening the knife, the improvedknife-moistening device mounted on said machine and comprisingmoistening elements arranged at opposite sides of the knife, meansmovably mounting said elements for movement away from operativepositions adjacent the knife in which they apply moisture to theopposite sides of the knife, to inoperative positions distant from theknife and out of the path of movement of said sharpening meanslengthwise of the knife edge, and spring means operating automaticallyto yieldingly hold said moistening elements in their operative positionsand to releasably retain said elements in their inoperative positions.

13. In a cutting machine comprising an upright reciprocating knife witha substantially upright cutting edge, and knife-sharpening means mountedand shiftable on the machine lengthwise along said edge for sharpeningthe knife, the improved moistening means for said knife comprising asupport adjustable vertically on said machine, moisture-confiningelements mounted on said support for vertical adjustment therewith andmovable on said support from operative positions adjacent opposite facesof the knife in which said elements contact with and apply moisture tosaid faces of the knife, to inoperative positions distant from the knifeand out of the path of movement of said knife-sharpening meanslengthwise of said knife edge.

CHARLES P. STEVENSON.

LESTER J. ULRICH.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 659,088 McKenzie Oct. 2, 1900767,076 Mattison Aug. 9, 1904 1,958,912 Clark May 15, 1934 2,149,731Greenbaum Mar. 7, 1939 2,294,497 Zawistowski Sept. 1, 1942

